Interior window condensation?
My first thought is to ask whether you have done anything else to change the way your house works recntly, from paint to insulation or siding. Have you begun to use a humidifier or had a plumbing leak in the basement?
Most problems of moisture on inside of the glass or frame indicate excessive moisture inside the house. The window is always the coolest exterior surface so this is where moisture laden air will drop its load as condensation.
But is is possible that the seals are beginning to go bad.
Andersen Windows has a really great video that helps explain condensation, why it happens, and how to prevent it (I am not employed by Andersen, nor sell their products). http://help.andersenwindows.com/system/selfservice.controller?CONFIGURATION=1000&PARTITION_ID=1&TIMEZONE_OFFSET=&CMD=VIEW_ARTICLE&ARTICLE_ID=2586
Here's the take-away from the video:
"Condensation doesn't mean there's a problem with your windows. In fact, the presence of condensation could actually be a sign that your windows have good, tight seals. Everything that makes homes more energy efficient also locks moisture inside your house and increases the chances of condensation forming."
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